Vernier dial



Nov. 31 1925.

H. CHARMS VERNIER DIAL Filed Dec. l1. 1924 9 6 vmwm? M www Patented Nov. 3, 1925.

UNITED STATES 1,560,140 PATENT OFFICE.

HARRY CHARMS, F NEW YORK, N. Y.

VERNIER DIAL.

Application med December 11, 1924. serial No. 755,128.

To all whom t may concern:

'Be it known that I, HARRY CHARMS, a citizen of Russia, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements inVernier Dials, of which the following is a specification.

This invention relates to improvements in vernier dials and has as its main object to provide a composite dial, one section of which may be used for approximate settings and another in obtaining extremely accurate readings.

yThe demand for finely adjustable dials, as used in connection with wireless telephone or radio apparatus, can be met only by a dial capable of two distinct movements, be -entirely self-contained, compact and of attractive appearance, and be easily operated by a novice. Y

. With the foregoing features in contemplation, the present invention will be hereafter described and illustrated in the accom used as a support for the structure, Which,-

as illustrated carries a shaft 11 engaged in a variable condenser 12 having fixed stator plates 13 and rotor plates 14, all of the ordinary type o-f construction.

The portion of the shaft 11 extending through the panel passes into a sleeve 15 having a hub 16 on'which is seated a disc 17 held stationary by a screw'18 engaging in the panel and provided with a spacer 19 so thatrthe .disc is maintained parallel with the panel, and the disc is held frictionally on the shoulder of the sleeve by a clamp nut 20.

The outer part of 'the sleeve contains a bored recess 21 into which a tapered screwthreaded/extension 22 of the sleeve projects, this extension being split, as at 23, into several parts so as to contact and grip tle,

end of the shaft 11 by reason of a tapered internally screw-threaded plug 24, fitting the bored recess 21 and having an extending stem 25 terminating in a screw-threaded end 26, the same being engaged in disc 27 -rotatably mounted on the outer end of the ing body 32 on which is a knurled ring 33 for convenience in operation.

Another enlargement 34, at the end of the cylinder provides a seat for the disc 27, which covers the bore or chamber 35 in the cylinder, and the cylinder is further supported on the periphery of the xed disc 17.

Secured in the outer end of the chamber 35 is a ring 36 having arms or spokes 37 fixed in a hub 38 provided with a tubular stem 39 rotatable on the stem 25, and hav-4 ing on its inner surface a spur gear 40.

Fixed on the outer side of the disc 17 is an outstanding bracket 41 offset to one side, and, on the opposite side of the disc is another, larger bracket 42,- offset in like manner and A having at its lend a right. angled member 43.

A spindle 44 is mounted at one end in the disc 17 to have a bearing in the member" 43, its extending end having fixed upon it a pinion 45 in mesh with the gear 38, and formed on the spindle 44 is a helix or worm 46, the axis of which is parallel to the shaft 11. A

Another spindle 47 is mounted transversely in the structure, its ends being journalled in the brackets 41 and 42. One end of the spindle is formed to present a worm gear 48 meshing with the worm 46, and midway in the length of the spindle is another worm 49 which meshes with a worm gear 50 formed on a sleeve 51 rotatably mounted on the sleeve 15' and clamped frict-ionally thereon by the nut 52.

From the foregoing it will be understood that rapid rotation of the disc 27 is conveyed directy to the dial 30, the friction sleeve 51 being suiciently free' to remain quiescent,

the Worm gearing `in the present case ap' v'merely acting as a brake or drag on the. -'shaft,` f

When the ring 33 isro'tated, motion- Will be conveyed. by the ring 36,.gear.40, pinion 45, spindle`44,'.and through the Worm trans' mission 46,148, ll9'and 50 to the sleeve .51,

which will, if properly adjusted, transmit a relatively. slow motion tothe shaft 11, the' ratio of reduction beingin accordance with proximately two hundred to.` one.

Hav-ingthus described'my inventiomandset forth the manner oi its construction and pe'ration', what I. claim as nevi7 and desire r to .secure by :Letters Patent, is -Y 1.,. In a Vernier dial, the combination with a-spindle, means for actuating the-spindle,1 anda primary dial operated 'by said spindle, 4of asecondary -dialrecessed into the primary dial, a hollow` cylindrical `extension l .on the secondary dial, a stationary disc on which *the ,cylinder rotates, means Afor anchoring said disc to asupport, brackets means vfor transmitting' motion lto said spin-` dle from said friction sleeve.

2.111 'a Vernier dia1,tte0mbinaion with .a s indie, means fonactuatingthe spindle,

. which the cylinder retates, means jfor an a primarydial operated by said spindle, of a. secondary dialrecessed into the! vprmaryA dial, a hollow cylindrical extension en the second-ary ,dial, a' stationary disc on anchoring saiddisc tov ja support, 'brackets extending' romsaid discinto the chamber in said cylinder, a spindle carried in one of said' brackets vparallel .with the first 'namedfspindla Va gear `centered .on the gfirst named spindle driven by said cylinder, a mating gear on tle second spindle, aitranslversespindle-journalledinsaid'ibraclrets, a Y

sleeve rictionally engaged on the irs't namdspindle to convey motion thereto,

Worm gear trains engaging the second namedv spindle with the transverse spindle, anda second worm gear tram 'connecting -said transverse spindle. and saidfslee've.

In a Vernier dial, the combination With a primary dial, of-.a sectional shaft, the sec'- tions of said .shaft being frictionally engaged, means for normally rotating' said shaft, means on said'shafttdrotate 4the primary dial, -a secondary dial havingA a -hollovv cylindrical extension through. which said lshaft passes, a disc having anchoring means and on which the secondary dial is rotatably mounted, a spindle parallel to I said shaft, a spindletransverse tothe shaft,

botlroi said spindles beingmoulited on said disc,- a'gearonfthe outer section of saidl shaft, means actuated-lby lsaid cylinder to rotate the' gear, a pinion orithe parallel shaft meshing with 'the gear, a s leeve'fric- -4 tionally `carried by4 the .inner section 'of said shaft, and Worm gear' trains'on said spindles .and sleeve ywhereby .a reduction .of speed Hanan-Gmane.- 

